SmartYouTubeTV: A YouTube client for set-top boxes and Android-based TVs.

Features:
4K support.
Designed for TV screens.
Any remote controller support.
Login support.
Doesn't depend on Google Services.
Fully localized.
Multilingual search keyboard.
Automatic update mechanism.
No root required!
NOTE: SmartYouTubeTV provides internal login mechanism which allows you to keep content up to date in a very convenient way.
Install SmartYouTubeTV:
Easy installation in less than 5 minutes with only the FireTV
Install SmartYouTubeTV (only FireTV needed)
Standard installation via ADB
If you don't know how to sideload/install apps via ADB, read a tutorial (e.g. this one)
Download latest SmartYouTubeTV APK and sideload/install with adb:
adb install -r SmartYouTubeTV_Orig.apk
Enjoy
How to change system language with only the MiTV3
How-to-enable-English-on-Android-5.1
Starting screen:
The device/resolution options at start launches different playing methods (as per https://github.com/yuliskov/SmartYouTubeTV/issues/15#issuecomment-364805950)
1080 Main - WebView
1080 Alt - XWalk
4K Main - Exoplayer + WebView
4K Alt - Exoplayer + XWalk
Also important, it's possible to select max resolution and codec (ie 1080/AVC1) via the start screen that will be applied on video loading (Codec option).
The Remember tick box acts as a configuration saving for next app launches.
Donation:
If you want to support my developments you are welcome to buy me a cup of coffee
Donation Alerts (RU, PayPal)
PrivatBank (UA)
BTC: 1JAT5VVWarVBkpVbNDn8UA8HXNdrukuBSx